Ultrapotassic igneous rocks

Ultrapotassic igneous rocks are a class of rare, volumetrically minor and generally ultramafic or mafic silica-depleted igneous rocks.

Ultrapotassic rocks are defined by molar K₂O/Na₂O >3 in much of the scientific literature. In other papers written as recently as 2005, they are defined as rocks with weight percents K₂O/Na₂O >2. Hence, caution is indicated in interpreting use of the term "ultrapotassic", and the nomenclature of these rocks continues to be debated.

单词	Ultrapotassic
释义	Ultrapotassic 英语百科 Ultrapotassic igneous rocks Ultrapotassic igneous rocks are a class of rare, volumetrically minor and generally ultramafic or mafic silica-depleted igneous rocks. Ultrapotassic rocks are defined by molar K₂O/Na₂O >3 in much of the scientific literature. In other papers written as recently as 2005, they are defined as rocks with weight percents K₂O/Na₂O >2. Hence, caution is indicated in interpreting use of the term "ultrapotassic", and the nomenclature of these rocks continues to be debated.
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